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Nick, I would start with the easiest things first and do a simple elimination until you figure out exactly why it won't start. #1 Spark plugs. #2 Spark plug wires. #3 ignition coils.#4 air/fuel filter. #5 Fuel injectors. #6 Fuel pump. #7 Electronic control module(ECM)/computer. If these things I have stated are replaced with new, then there is no reason it shouldn't start. I gave you this list as easiest to hardest to replace. You may find that the problem is only with the spark plugs, then obviously you have detected the issue and do not need to continue replacing components. I hope this helps, and good luck. ^^

If it turns over hard in the morning then either something is staying on and draining the battery or the battery is nearing the end of its life. Check things like the glovebox light, trunk light for staying on. Simply remove the bulbs and see if that helps. If not , you should pick up a new battery.

If it turns over good the problem would be either the cold start system or your fuel system is losing pressure overnight. This would require furthur diagnosis. Hope this helps.

The sound is a relay switching over when you insert the key and power the vehicles accesories. It is a normal sound, but whatever that relay powers may fail soon. It sounds like the small electromagnet inside won't hold the voltage, hence the clicking sound.